JPH04194832A - Instant camera - Google Patents

Abstract

PURPOSE:To provide an instant camera having a film feeding mechanism taking maintainability of a work to clean a developing roll into consideration by running a motor in a reverse direction to reverse only the developing roller. CONSTITUTION:When a back cover 21 is opened in a state to bring a camera into a using state and a reversing operation button 23 is pressed, a motor 30 is reversed and a developing roller 24 is rotated in a direction reverse to a direction in which a film unit is fed to a discharge port. In this case, running of the motor 30 in a reversing direction is not transmitted to a claw member 32 by means of a clutch mechanism. This constitution performs cleaning of the roller 24 from the interior of a film pack containing chamber 22 as the roller 24 is automatically rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an instant camera, and more particularly to a film unit feeding mechanism.

[Conventional technology]

Instant cameras that use self-developing film units have the great advantage of being able to print photographs on the spot they are taken, and are used for a variety of purposes. Among instant cameras that use a mono-sheet type film unit, when the release button is pressed and exposure is completed, a well-known scraping claw moves within a notch formed in the exposure frame of the film pack. Then scrape out the uppermost film unit stacked inside the film puncture. In this scraped-out film unit, the developing solution retaining pond is torn open by a pair of developing rollers, and the developing processing solution contained in the developing solution pond is spread and then discharged out of the camera. At this point, the film unit has completed the necessary processing, and a printed photograph can be obtained after a predetermined period of time has elapsed.

Such a film unit feeding mechanism of an instant camera is disclosed in, for example, Utility Application No. 1-185 filed by the present applicant.
As is known from No. 42, etc., after completion of exposure, the motor is driven in a fixed direction to operate the scraping claw and the unfolding roller via the claw drive mechanism and roller drive mechanism.

By the way, after scraping out the exposed film unit from the film puncture and pushing its leading end into the developing roller, it is necessary to return the scraping claw to the initial position for the next photographing. For this reason, the operation of the scraping claw is synchronized by a one-rotation detection gear that rotates once every time the film unit is fed out and detects the timing of stopping the motor drive. is separated from the claw drive mechanism and returned to the initial position when the film unit is completely ejected from the camera.

However, in the above-mentioned instant camera, if the developing roller is coated with a developing solution, the developing roller must be cleaned. This is because if the developing solution is left attached to the developing roller, it will solidify on the surface of the developing roller, causing uneven development.

Conventional instant cameras have a structure in which the unfolding roller is removable from the camera body or a structure in which the unfolding roller is exposed on the camera body, in consideration of ease of maintenance when cleaning the unfolding roller. However, in such a structure, the number of parts increases, leading to an increase in cost, and there is a risk that secondary failures may occur due to removal of the unfolding roller. Further, in a structure in which the developing rollers are exposed to the camera body, it is not possible to clean the entire circumferential surface of the pair of developing rollers. This is because the developing rollers are directly connected to the motor that drives them via gears, so the pair of developing rollers cannot be rotated. Therefore, there has been a demand for a structure in which the motor is driven in the reverse direction to improve the maintainability of the cleaning work of the unfolding roller.

[Problem that the invention seeks to solve]

However, conventional film feeding mechanisms do not take into consideration driving the motor in the reverse direction, so when the motor is driven in the reverse direction, the scraping claw does not return to its initial position1. Not only that, but there was also a risk that the scraping claw would malfunction.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide an instant camera having a film feeding mechanism that takes into consideration the maintainability of the cleaning work of the developing roller.

[Means for solving problems]

In order to solve the above object, the present invention includes a claw member for ejecting an exposed film unit from a film back;
A pair of developing rollers that feed out the film unit ejected by the claw member while applying pressure to spread the developing processing solution, a motor that drives both the motor and the developing roller, and a motor that rotates forward and reverse. a roller drive mechanism that transmits a driving force in the direction to the developing roller; a claw drive mechanism that transmits the driving force of the motor only in the normal rotation direction to the claw member via a clutch mechanism; and a one-rotation detection gear that detects the timing of stopping the drive of the motor by making one rotation, and the clutch mechanism has a timing means responsive to the one-rotation detection gear that detects the claw member while the spreading roller is being driven. When the claw member returns to the initial position, it is separated from the claw drive mechanism, and the claw member is stopped at the initial position.

[Operation] According to the above configuration, the driving force of the motor in the reverse direction is not transmitted to the claw member by the clutch mechanism, and
The clutch mechanism is configured to disconnect the claw member from the claw drive mechanism when the claw member returns to the initial position while the unfolding roller is being driven by a timing means responsive to the one rotation detection gear;
The claw member is stopped at the initial position. Therefore, the driving force of the motor in the reverse direction causes only the unfolding roller to reverse through the roller drive mechanism.

Embodiments of the present invention will be described below with reference to the drawings.

(Example) In FIG. 2 showing a usage state of an instant camera using the present invention, FIG. 3 showing a non-use state of this camera, and FIG. 4 showing a rear side of this camera, this camera is a thin type. A main body part 10 having a box-like outline, and this main body part 10
It is composed of a lens board 11 that can be raised and lowered freely, a lens stay 12 that holds the lens board 11 from below, and a snake 11113 that covers the photographing optical path between the main body 10 and the lens board 11.

The lens board 11 is provided with a photographic lens 40° on the front, and a shank, an aperture mechanism, etc. inside the front.When the camera is not in use, the main body 1 is mounted around the fixing member 26.
It is laid down in front of 0.

The lens stay 12 is engaged with the lens board 11 and the main body 10 so as to be interlocked with the lens board 11, and when the camera is not in use, the guide pin 28 slides in the groove 47 and closes the back cover 21. It is designed to be stored on the back side of the.

The bellows 13 is folded in response to the collapse of the lens board 11 and is housed between the main body 10 and the lens board 11.

The main body 10 has a shutter button 16, a viewfinder 17. The strobe device 18 is provided with an ejection opening 19 on its top surface from which a film unit that has been photographed is ejected.

Further, as shown in FIG. 4, a back cover 21 is provided on the back surface of the main body 10 via a hinge 20.

When the back cover 21 is opened, a film pack storage chamber 22 is exposed, and a mono-sheet type film pack is loaded into this film bank storage chamber 22. Inside the film bag storage chamber 22, a reversing operation button 23 for reversing the motor, which will be described in detail later, is provided on a surface that is one step lower than the receiving surface 22a. Further, a pair of developing rollers 24 are built in above the film pack storage chamber 22, which crush the developer pot and spread the developing solution while discharging the exposed film unit.

The film pack stores stacked film units each provided with a developer pot. Such a film pack is provided with a slit upwardly for ejecting the exposed film unit toward the developing roller 24, and is also provided with an opening frame in front that defines the range of the photographic screen. This opening frame is also provided with a notch into which a claw member, which will be described later, will fit.

Inside the main body 10, as shown in FIG.
A roller drive mechanism 31 that transmits the driving force of the motor 3 to the expansion roller 24, and a claw drive mechanism 33 that transmits the drive force of the motor 3° in the normal rotation direction to the claw member 32 via a clutch mechanism are arranged. The main parts of these mechanisms are shown in FIG. Note that reference numeral 25 is a control circuit that electrically controls the entire camera.

The motor 30 is driven in the normal rotation direction in response to a control signal from the control circuit 25 as the shutter button 16 is operated. Further, when the reverse rotation operation button 23 is operated, the motor 30 is driven in the reverse direction in response to a control signal from the control circuit 25.

The motor 30 is driven by a gear 35 for driving the developing roller 24 via a planetary gear device 34 and a gear 35.
a, 36. Note that the yuri gear device 34
is a device for decelerating the drive of the motor 30 to a constant rotation within a narrow space and further transmitting the high torque to the developing roller 24 and the like.

Furthermore, the drive of the motor 30 is from the gear 35 to the gear 37.
transmitted to. This gear 37 is approximately 3 for one shooting.
．． It is a gear that rotates seven times, and a clutch cam 38 is integrally fixed to the rear end side of the gear. A rotatable low drive cam 41 is provided behind the gear 37 and is rotatably mounted on the rotation shaft 39 of the gear so as to sandwich the clutch cam 38 therebetween. When the claw drive cam 41 rotates, it comes into contact with each of the bent portions 32a and 32b of the claw member 32, and drives the claw member 32 to slide in the vertical direction relative to the support shafts 52 and 53.

When the motor 30 is driven in the normal rotation direction, the claw drive cam 41 engages with the clutch cam 38 and the motor 3
A taranotile lever 41 that transmits a driving force of 0 to the claw member 32 is provided via a spring 43. Further, when the motor 30 is driven in the reverse direction, the clutch lever 41 is disengaged from the clutch cam 38, and the driving force of the motor 30 in the reverse direction is transferred to the claw member 32.
It is configured so that it is not transmitted.

The motor 30 is driven by a gear 37 and a gear 37a.
, 45.45a, to a one-cycle gear 46 that rotates once every - times.

A switch contact piece 46a having electrical short-circuit parts at both ends is fixed to the rear surface of the one-cycle gear 46. In addition, a switch contact piece 4 is provided on the rear end side of the 1-cycle gear 46.
The one-rotation detection substrate 48 is inserted into the main body 1 so as to sandwich the rotation detection plate 6a.
Fixed to 0.

This single rotation detection board 48 has the switch contact piece 46
Contact portions 48a and 48b are provided on which the short-circuit portions of the switch a and the contact portions 48a slide, respectively, and when the one-cycle gear 46 rotates once, the short-circuit portion of the switch contact piece 46a and the contact portion 48a slide.
, 48b is turned off once. Then, the one rotation detection substrate 4
8 is electrically connected to a control circuit 25, and when the electrical connection between the short circuit part of the switch contact piece 46a and the contact parts 48a and 48b is turned off, the control part 25 starts driving the motor 30. make it stop.

Note that a protrusion 46b is provided on the circumferential surface of the one-cycle gear 46 at the negative part, and this protrusion 46b is connected to the lever 4.
When the lever 49 comes into contact with the pin 49a of No. 9, the lever 49 turns to the right around the support shaft 50, and the release lever 51 is retracted from the rotating surface of the clutch lever 42, thereby locking the clutch lever 42 and the clutch cam 38 together. enable.

Hereinafter, the operation of the instant camera configured as described above will be briefly explained.

When not photographing, the protrusion 46 is closed as shown in FIG.
b and the pin 49a are not in contact with each other, so the release lever 51 releases the engagement between the clutch lever 42 and the clutch cam 38. Further, the claw drive cam 41 presses down the bent portion 32b of the claw member 32, and the claw member 32 is in the initial position. Further, the electrical connection between the short circuit portion of the switch contact piece 46a and the contact portions 48a and 48b is turned off.

From this state, as shown in FIG. 2, the camera is put into use and a photograph is taken. To take a picture, the shutter button 16 is pressed as is well known. As a result, the shutter and aperture mechanism operate, and the film unit is exposed to the subject light incident from the photographic lens 40.

After the exposure is completed, driving of the motor 30 in the forward rotation direction is started. By driving this motor 30, the planetary gear device 34. The developing roller 24 is rotated via gears 35, 35a and 36 in a direction to send out the exposed film unit to the discharge port 19.

Furthermore, the drive of the motor 30 is from the gear 35 to the gear 3't.
37a, 452.45a to the one-cycle gear 46. When this one-cycle gear 46 rotates, the sixth
As shown in the figure, the protrusion 46b comes into contact with the pin 49a, and the release lever 51 is retracted from the rotating surface of the clutch lever 42. In addition, the short circuit part of the switch contact piece 46a and the contact part 48a
, 48b is turned on.

When the release lever 51 is retracted from the rotating surface of the clutch lever 42, the clutch lever 42 and the clutch cam 38 are engaged by the bias of the spring 43, and since the gear 37 is rotating as described above, the claw drive cam is activated. 41 rotates, and the claw member 32 is driven to slide.

Therefore, the claw member 32 feeds out the exposed film unit toward the developing roller 24 through a notch provided in the film pack.

After that, the film unit sent out is transferred to the developing roller 24.
As a result, the developer bond is torn open, and the developer solution contained in the developer pond is spread out and then discharged from the discharge port 19. At this point, the film unit has completed the necessary processing, and a printed photograph can be obtained after a predetermined period of time has elapsed.

Note that as the rotation of the 1-cycle gear 46 progresses, the protrusion 46b
When the clutch lever 49a has passed over the pin 49a, the release lever 51 has returned to the rotation plane of the clutch lever 42, and when the clutch lever 42 approaches the second rotation, it comes into contact with the release lever 51, and the clutch lever 42 and clutch cam 38
The engagement with is released. This state is the initial position of the claw member 32 as shown in FIG. therefore,
The claw member 32 is driven so as to slide back and forth only once for one photographing session.

Thereafter, when the one-cycle gear 46 rotates once and the electrical connection between the short circuit part of the switch contact piece 46a and the contact parts 48a and 48b is turned off, the control circuit 25 stops driving the motor 30.

Next, the operation when cleaning the developing roller 24 will be briefly explained.

First, when cleaning the developing roller 24, it is performed when no film puncture is loaded in the film puncture storage chamber 22. As shown in FIG. 2, the camera is put into use and the back 121 is opened. Thereafter, when the reverse operation button 23 is pressed, the control circuit 25 starts driving the motor 30 in the reverse direction. The drive of the motor 30 causes the developing roller 24 to rotate in the direction opposite to the direction in which the film unit is delivered to the discharge port 19 via the idle gear device 34 and gears 35, 35a, and 36.

As a result, cleaning of the developing roller 24 can be performed by cleaning the developing roller 24.
While automatically rotating the film pack storage chamber 2.
This can be done from within 2. Furthermore, when cleaning is performed by directly contacting the developing roller 24 with a cleaning member and wiping it off, the rotation of the developing roller 24 is rotated in the opposite direction to the direction in which the film unit is sent out to the discharge port 19. Therefore, there is no risk of the cleaning member getting caught during the wiping operation.

Further, the motor 30 is driven in the reverse direction by a gear 35.3.
However, since the clutch cam 38 rotates to the right and is no longer engaged with the clutch lever 41, it is not transmitted to the claw 6 (HfB2).

Further, the motor 30 is driven from a gear 37 to a gear 37a,
45 and 45a, to the one-cycle gear 46. Therefore, the one-cycle gear 46 rotates, and the electrical connection between the short circuit part of the switch contact piece 46a and the contact parts 48a and 48b is turned on. After that, when the 1-cycle gear 46 rotates once, the short circuit part of the switch contact piece 46a and the contact part 48a.

The control circuit 25 stops driving the motor 30 when the electrical connection with the motor 48b is turned off.

〔Effect of the invention〕

As described above, according to the instant camera of the present invention, since the unfolding roller rotates when the motor starts to be driven in the reverse direction, there is an effect of improving the maintainability of the unfolding roller cleaning work. Furthermore, since the drive in the reverse direction of the motor is not transmitted to the claw member by the clutch mechanism, cleaning of the unfolding roller can be performed safely and without damaging the claw member. Furthermore, cleaning the unfolding roller is performed from within the film pack storage chamber, and since the unfolding roller rotates in the opposite direction to the direction in which the film unit is fed out, it is difficult to clean the unfolding roller during cleaning. This can be done safely without the risk of getting the parts involved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the main parts of an instant camera using the present invention. FIG. 2 is a perspective view of the instant camera in use. FIG. 3 is a perspective view of the instant camera in an unused state. . FIG. 4 is a rear view of the instant camera in use. FIGS. 5 and 6 are explanatory diagrams schematically showing the film unit feeding mechanism. 10... Main body 11... Lens board 12... Lens stay 22... Film bank storage chamber 23...
... Reverse operation button 24 ... ... Expansion roller 30 ... ... Motor 32 ...
... Claw member 34 ... Planetary gear device 38 ... Clutch cam 41 ... Claw drive cam 42 ... Clutch lever 46 ... ...1 cycle gear 46b ...Protrusion 48 ...1 rotation detection board 49 ... Lever 51 ... Release lever. 12 (Lens stay) Fig. 5 49 - - - - - Lever 5 + - - - Release lever Fig. 6

Claims (1)

[Claims] (1) A common motor drives a claw member that ejects the exposed film unit from the film pack and a pair of developing rollers that pressurize and feed out the film unit ejected by the claw member to spread the developing solution. The instant camera is configured to include a roller drive mechanism that transmits the driving force of the motor in the forward and reverse directions to the developing roller, and a clutch mechanism that transmits the driving force of the motor only in the forward rotation direction to the developing roller. The clutch mechanism includes a claw drive mechanism that transmits the transmission to the member, and a one-rotation detection gear that makes one rotation each time the film unit is fed out to detect the timing of stopping the drive of the motor, and the clutch mechanism is responsive to the one-rotation detection gear. An instant camera characterized in that timing means disconnects the claw member from the claw drive mechanism when the claw member returns to the initial position while the developing roller is being driven, thereby stopping the claw member at the initial position.